Abstract: This method controls the drone in order to flip through a complete turn about its roll axis or its pitching axis. It comprises the steps of: a) controlling its motors simultaneously so as to impart a prior upward vertical thrust impulse to the drone; b) applying different and non-servo-controlled commands to the motors so as to produce rotation of the drone about the axis of rotation of the flip, from an initial angular position to a predetermined intermediate angular position; and then c) applying individual control to the motors, servo-controlled to a reference target trajectory, so as to finish off the rotation of the drone through one complete turn about the axis of rotation, progressively from the intermediate angular position with a non-zero angular velocity to a final angular position with a zero angular velocity.

Abstract: The invention relates to a calibration method for a device having a scan function (1), in particular a device measuring in polar coordinates, comprising an electro-optical distance measuring element (5) having a laser axis as the target axis (3), a motorized optical deflection unit (7), which deflects the target axis (3) by a deflection angle, and an angle measuring element for determining at least one angular position of the deflection unit (7). To this end, the following steps are carried out: first measurement of angle coordinates of a reticle in a first angular position of the deflection unit (7) as the first position, and second measurement of angle coordinates of the reticle in a second angular position of the deflection unit (7) as the second position, wherein the first position and second position are different from each other, in particular wherein the first position is rotated relative to the second position in two axes such that the reticle in both positions points at least approximately in the same spatial direction. The first and second measurements of the reticle are carried out on the basis of images taken with a camera (4), the optical axis of which is deflected by the deflection unit, and calibration parameters are determined on the basis of the angular positions and the angular coordinates in the first and second positions.

Abstract: A tissue disruption device (10) for deployment via a rigid conduit (100) includes a rotary tissue disruptor (12) insertable along the conduit with its axis of rotation (14) parallel to the direction of conduit elongation (16). An angular displacement mechanism allows selective displacement of the rotary tissue disruptor (12) such that the axis of rotation (14) sweeps through a range of angular motion. A rotary drive is linked to the rotary tissue disruptor so as to drive the rotary tissue disruptor in rotary motion while the rotary tissue disruptor is at a range of angular positions within the range of angular motion.

Abstract: The invention relates to a laser detection device and method for gear parameters. The laser detection device is characterized in that a worktable is provided with an internal point; a laser displacement sensor is arranged on a bracket; the bracket is arranged on a linear motor sliding block of a sliding table; the sliding table is arranged on an angular displacement rotating system and is fixedlyconnected to a rotating disk together with a rotating shaft; a casing of the angular displacement rotating system is arranged on a lifting arm through screws; the lifting arm is connected with the vertical surface of a machine body through a high-precision linear guide rail and a sliding block; a servo motor drives a ball screw which is fixedly connected to the vertical surface of the machine body to rotate; and a data acquisition and communication system is arranged on a rotating shaft upper plane of the angular displacement rotating system. Tested workpieces are subjected to data measurement, acquisition, transmission, reconstruction, separation, comparison and display to finish the full process of detection. According to the laser detection device and method, the non-contact and blind spot-free measurement is realized, the detection speed and measurement precision are improved; the difficult problem that a pinion is difficult to detect is solved; and in the measuring process, the gear is stationary and a measuring head does measuring movement, thus the measuring error caused by mounting the gear is reduced.

Abstract: A rotation angle sensor for detecting an absolute rotation angle upon single or multiple revolutions includes a magnetic field sensor and an encoder arrangement. The magnetic field sensor detects at least two orthogonal magnetic field variables. The encoder arrangement is rotatable depending on the absolute rotation angle relative to the magnetic field sensor, such that the magnetic field detected by the magnetic field sensor is dependent on a relative angular position of the encoder arrangement with respect to the magnetic field sensor. The encoder arrangement is furthermore displaceable relative to the magnetic field sensor. The relative angular position and the relative translational position of the encoder arrangement with respect to the magnetic field sensor is determined from the at least two orthogonal magnetic field variables. The absolute rotation angle is determined by means of the relative angular position and the relative translational position.

Abstract: We propose a simple way to measure the three-dimensional rotational diffusion of micrometric wires, using two-dimensional video microscopy. The out-of-plane Brownian motion of the wires in a viscous fluid is deduced from their projection on the focal plane of an optical microscope objective. An angular variable reflecting the out-of-plane motion, and satisfying a Langevin equation, is computed from the apparent wire length and its projected angular displacement. The rotational diffusion coefficient of wires between 1 and 100 μm is extracted, as well as the diameter distribution. Translational and rotational diffusion were found to be in good agreement. This is a promising way to characterize soft visco-elastic materials, and probe the dimension of anisotropic objects.

Abstract: The device to measure the absolute rotation angle of a rotating shaft includes a rotating disc, fixed to the shaft. A group of permanent magnets of different sizes and polarities is disposed on a circular track. Further, a group of Hall sensors, fixed to a static part of the device, are disposed on a circular path, in proximity of the rotating disc magnets tracks, and generate electric signals proportional to the strength of the magnetic field produced by the magnets in proximity. The signs of these electric signals are used to calculate a code characteristic of a low resolution absolute angular position. Two analog signals are associated to the obtained code, according to a pre-defined table. The associated analog signal having the closest value to zero is used as an entry to a pre-recorded table containing the correspondent angular position of the shaft.

Abstract: A small angle measurement method based on total internal multi-reflection (TIMR) effect has been presented. In the proposed configuration, the semiconductor laser with single-mode fiber affords the stable illumination beam, and the beam expander induces a gain factor enlarging the small angular displacement, thus improving the angle measurement sensitivity and stability simultaneously. The experimental results show that our method has better sensitivity and higher stability than the conventional method. These results in association with the theoretical analysis, demonstrates the potential applicability of the presented method in high precision on-line measurement of small angle.

Abstract: The invention discloses a defective cable and support angular displacement progressive identification method based on mixed monitoring of temperature change. The method comprises the following steps of: on the basis of mixed monitoring, judging whether a mechanical calculation reference model of a cable structure is required to be updated by monitoring the temperature of the cable structure, environment temperature and the health state of an evaluated object, and thus obtaining the mechanical calculation reference model of the cable structure, into which the temperature of the cable structure and the environment temperature are recorded; and on the basis of the mechanical calculation reference model, acquiring a unit damage monitored amount unit change matrix by calculation. A non-inferior solution of the current nominal damage vector of the evaluated object is obtained by calculation according to an approximately linear relationship between the current value vector of monitored amount, the current initial value vector of the monitored amount, the unit damage monitored amount unit change matrix, a unit damage or unit angular displacement vector and the to-be-obtained current nominal damage vector of the evaluated object, so a damaged cable, a loosened cable and support angular displacement can be quickly identified when the temperature change occurs.

Abstract: A system and method for sensing torque and angular position of a rotating shaft may include a shaft with a magnetostrictive ring affixed to the shaft. The magnetostrictive ring may generate position-dependent magnetic fields relative to the shaft's rotation. A first sensor may measure a magnetic field that varies with angular position. A second sensor may measure a magnetic field that varies with torque.

Abstract: The utility model relates to a multi-dimensional adjusting stereoscopic shooting dual-position device which comprises a base length adjusting structure, an azimuth angle adjusting structure, a horizontal inclination angle adjusting structure and a pitch angle adjusting structure. The base length adjusting structure adjusts the space between to sliding blocks through a shaft and enables two cameras to move in the same direction or the reverse directions. The azimuth angle adjusting structure synchronously, equiangularly and reversely rotates a turntable through a shaft and accordingly adjusts the azimuth angle of the two cameras. The horizontal inclination angle adjusting structure adjusts the horizontal inclination angle of a camera, and the pitch angle adjusting structure adjusts the pitch angle of the other camera. The base length adjusting structure and the azimuth angle adjusting structure are independent mutually and respectively control the two cameras to be synchronously and reversely adjusted respectively through the shaft so as to ensure that the symmetric center of the two cameras does not change. Two angular displacement tables are adopted for the horizontal inclination angle adjusting structure and the pitch angle adjusting structure and are arranged on the two turntables in angle rotating direction orthogonality mode, one angular displacement table is used for adjusting the horizontal inclination angle of a camera, and the other angular displacement table is used for adjusting the pitch angle of the other camera. Therefore, stereoscopic effect adjusting and perfect alignment of shot objects at positions of different distances are achieved.

Abstract: In one example, a rotary position sensor is provided. The rotary position sensor comprises an integrated circuit, a first magnetic field angular position sensor, and a second magnetic field angular position sensor. The first magnetic field angular position sensor provides at least a first signal to the integrated circuit and the second magnetic field angular position sensor provides at least a second signal to the integrated circuit. The integrated circuit is configured to provide an output signal indicative of an angular position of a magnetic field, wherein the output signal is based at least on the first signal and the second signal, and wherein the output signal has an angular range of approximately 360 degrees.

Abstract: This device (20) comprises a first sensor (22) of a radial measurement of the tubular component (12) and a support (24) able to drive the first sensor (22) along a circular trajectory in a predefined plane orthogonal to the principal axis of the component (12). In particular, the support (24) comprises a main body (26) able to be fixed by freeable fixing means (28) to the component and a rotation shaft (30) onto which is fixed an arm (32) bearing the first sensor (22) so as to allow the displacement of the first sensor (22) along a circular trajectory inside or around the component (12). Furthermore, the device (20) comprises a second sensor (34) for measuring an angular position of the first sensor (22) for each of its radial measurements, the radial and angular measurements obtained making it possible to determine the profile of the component (12) in the predefined plane (P).

Abstract: Flexible bearings are advantageous for microelectromechanical systems as they enable precise, accurate, repeatable, and reliable motion without frictional contact. Based on the principle of a rotary folded-beam suspension, we have designed, fabricated, modeled, and characterized an electrostatic rotary stepper micromotor in silicon. Using 3-D finite-element analysis simulations that were corroborated by extensive characterizations performed in quasi-static, transient, and dynamic regimes, we could establish a consistent electromechanical model of the motor. In particular, dynamic nonlinearities such as superharmonic and subharmonic resonances are well described by the proposed model. Two prototypes of monolithic three-phase stepper motors have been fabricated with standard silicon-on-insulator (SOI) technology, using either a two-mask or a single-mask process. The two-mask SOI motor has a rotor diameter of 1.4 mm and has an angular range of 30° (±15°) for a 65-V (130 Vpp) sinusoidal actuation. The single-mask SOI motor has a rotor diameter of 1.8 mm and incorporates a differential capacitive sensor for angular position measurement. It reaches a maximum angular speed of 1°/ms and has an angular range of 30° for a 23-V (46 Vpp) sinusoidal actuation. The exceptional performance of the motor and the demonstration of successful capacitive sensing make it suitable for use as an active joint module in future microrobotic applications.

Abstract: The application of dual-grating moire fringe is introduced in lithography alignment. Minute angular displacement between the two alignment marks will lead to the tilt of moire fringe, which has an influence in high-accuracy alignment. Proposed is a novel measurement method of angular displacement based on the phase of moire fringe. The relationship between phase of moire fringe and angular displacement is analyzed. Both simulation and experiment indicate that an angular displacement can be determined to achieve a linear displacement measurement with error of nanometer level.

Abstract: Disclosed are systems and methods for measuring multi-turn position of a shaft with high resolution and in a non-contact manner. In some embodiments, a multi-turn sensing apparatus can include a rotation counter configured to determine a number of turns made by a shaft, and an angular position sensor configured to measure an angular position of the shaft within a given turn. The number of turns can be determined with an M-bit resolution, and the angular position per turn can be measured with an N-bit resolution. Selected appropriately, the rotation counter can be configured to operate as a relatively low resolution; and yet the multi-turn sensing apparatus can maintain the N-bit per-turn angular resolution throughout the full range. Accordingly, the multi-turn sensing apparatus can have an effective resolution of M+N bits.

Abstract: The present invention is concerned with a method, an apparatus and a computer program for monitoring the condition of electromechanical systems in which electrical rotating machinery is used and in which at least one electrical signal is measured during an operation of the electromechanical system. The inventive method comprising the steps of measuring current and/or voltage signals of an electromechanical system, measuring an angular position of a rotating shaft of interest of the electromechanical systems or estimating the value of discrete angular position of a rotating shaft of interest of the electromechanical system, synchronizing the current and/or voltage signals to the scaled angular displacement of the rotating shaft, dividing the synchronous electrical signals into intervals corresponding to each completed rotation of the rotating shaft, averaging a number of intervals of synchronous electrical signals to obtain an average synchronous electrical signal, extracting characteristic data of the magnitude from the values of the average synchronous electrical signal, comparing the extracted characteristic data of the magnitude with a threshold which is given as a limit and indicating an alarm to the user when the limit is exceed.

Abstract: A magnetic rotational position sensor assembly for measurement of a rotational angular position of a rotating structure. The sensor assembly includes a shaft member extending along a primary rotational axis for primary rotational movement in response to rotation of the rotating structure, a motion conversion member structured and configured to transform the primary rotational movement of the shaft member into secondary movement, a magnet member secured to the motion conversion member for displacement along a travel path in response to the converted secondary movement of the motion conversion member, and a non-contact magnetic sensor that senses a change in position of the magnet member by sensing a corresponding variation in the magnetic field during displacement of the magnet member along the travel path in response to rotation of the rotating structure, wherein the magnetic sensor generates an output signal representative of a relative rotational angular position of the rotating structure.

Abstract: A simple but efficient angle sensor designed and developed by combining variable reluctance technique and Hall-Effect sensing principle is presented in this paper. This new sensor possesses the best features of both the schemes and overcomes the demerits of reluctance type sensors. It proposes the use of a spiral shaped element which rotates in unison with the target whose angular position is to be sensed. The rotating spiral varies the reluctance in the flux path of a Hall Effect sensor as sensing angle changes. The resulting variation in the Hall sensor output is shown to be linear using finite element analysis. The scheme does not require any complex signal conditioning circuitry. A simple electronic scheme for calibrating the proposed sensor output against changes in various electrical, magnetic and mechanical parameters is also presented. A prototype angle sensor assembly based on the proposed principle has been built and tested. The output obtained from the sensor was found to be linear, as expected, across a wide range with a worst-case error less than 1 %. The new sensor will be useful for various scientific and industrial angle sensing applications.

Abstract: The invention relates to the field of relevant technology of electronic equipment, in particular to handheld electronic equipment and a video playing and controlling method thereof. The method includes playing videos on a touch sensitive display; detecting rotary contact on the touch sensitive display and the quantity of contact points of the touch sensitive display; determining angular displacement of the rotary contact and a reference position, and determining rate series according to the quantity of the contact points of the touch sensitive display; calculating a total video playing deviation value=the angular displacement X the rate series X video playing deviation values corresponding to each degree of angular displacement; and proportionally controlling playing of the videos according to the total video playing deviation value. A user can control playing of the videos by the aid of the rotary contact, a mode of using a progress bar is omitted, and accordingly the user can more accurately control the playing progression of the videos and find out an interested image.

Abstract: Linear and angular control of trunk and leg motion during curvilinear navigation was investigated in subjects with cerebellar ataxia and age-matched control subjects. Subjects walked with eyes open around a 1.2-m circle. The relationship of linear to angular motion was quantified by determining the ratios of trunk linear velocity to trunk angular velocity and foot linear position to foot angular position. Errors in walking radius (the ratio of linear to angular motion) also were quantified continuously during the circular walk. Relative variability of linear and angular measures was compared using coefficients of variation (CoV). Patterns of variability were compared using power spectral analysis for the trunk and auto-covariance analysis for the feet. Errors in radius were significantly increased in patients with cerebellar damage as compared to controls. Cerebellar subjects had significantly larger CoV of feet and trunk in angular, but not linear, motion. Control subjects also showed larger CoV in angular compared to linear motion of the feet and trunk. Angular and linear components of stepping differed in that angular, but not linear, foot placement had a negative correlation from one stride to the next. Thus, walking in a circle was associated with more, and a different type of, variability in angular compared to linear motion. Results are consistent with increased difficulty of, and role of the cerebellum in, control of angular trunk and foot motion for curvilinear locomotion.

Abstract: The invention provides a time grating angular displacement sensor which belongs to displacement precise measuring devices. The sensor comprises a frame which is used for winding a coil and composed of an outer circle matrix and an inner circle matrix; and slots are formed on the inner peripheral wall of the outer circle matrix and the outer peripheral wall of the inner circle matrix at equal intervals. The sensor is characterized in that the excitation coil is wound on the matrix, and the induction coil is wound on the other matrix; the induction coil and the excitation coil carry out the relative motion; the excitation coil is connected with an excitation power supply, an excitation signal and an electric signal which is output by the induction coil are respectively connected to an amplification circuit and subjected to the phase comparison by a digital phase comparator after the shaping by a shaping circuit; and the phase difference of the two signals is represented by the number ofinterpolated clock pulses, further converted to the angular displacement value and directly or indirectly displayed as the angular displacement data after the treatment by a microprocessor and a memory. The sensor has the advantages of simple structure, low cost, high resolution, strong anti-interference ability and easy productization.

Abstract: A device is arranged for imparting an orbital angular momentum to a charged particle wave propagating along an axis in a charged particle beam generating apparatus. The device includes a first conductive element comprising a plurality of angularly spaced electrical conductors arranged around the axis, and a second conductive element. The first and second conductive elements are spaced apart along the direction of the axis, and are adapted for transmitting a charged particle wave propagating along the axis. A connecting means is adapted for supplying an electrical potential to the plurality of angularly spaced electrical conductors for inducing an angular gradient of the phase of the charged particle wave when transmitted along the axis, in which the projection along the axis of the electrical potential varies as a function of an angular position with respect to the axis.

Abstract: The utility model relates to a laser detection device for gear parameters, characterized in that: a bed is connected with the ground by adopting a vibration isolation foundation therebetween, a workbench is fixedly connected with the bed through bolts, a support is arranged on a linear motor sliding block of a sliding table, and the support can drive a laser displacement sensor assembly to move along a horizontal axis under the driving of a linear motor; the sliding table is arranged on a rotating disk of an angular displacement rotating system, wherein the rotating disk is fixedly connected with a rotating shaft, and the angular displacement rotating system can rotate along a vertical axis; a data acquisition and communication system is arranged on an upper plane of the rotating shaft of the angular displacement rotating system, leads of a laser displacement sensor and the linear motor of the sliding table pass through a rotating shaft hollow hole of the angular displacement rotating system so as to connect with the data acquisition and communication system; a servo system and a data processing and display system are arranged in an electronic control cabinet; and a center hole of a positioning cone ring is sleeved on a rod of a mandrel. According to the laser detection device of the utility model, a laser displacement non-contact measurement technology is employed to realize gear non-blind spot high-speed scanning, thereby raising detection speed and data sampling rate; an unique working mode that the detected gear is static, and only a measuring head performs a measuring motion is employed, and no clamp is needed in the measuring process, thereby raising flexibility and detection precision of the measuring system, and raising detection speed; and the technical problem for plotting unknown gear parameters at present can be solved, and the measurement for complex-shaped bodies such as worm gears and so on also can be realized.

Abstract: The invention relates to a method for measuring high frequency micro vibration of triaxial angular displacement of satellite payload. The method comprises the steps of measuring linear acceleration and utilizing the amplification effect generated by twice integration of a high frequency signal, thus realizing high accuracy measurement at low cost. Analysis shows that an acceleration meter with the accuracy of 10-4g can be adopted for 50Hz angular displacement with the amplitude of 10-6 degrees under the condition of a 1m reference line, thus greatly reducing the accuracy of an instrument and reducing the measurement cost. The invention provides a method for measuring the vibration quantity under two conditions of full time and time window.

Abstract: Nowadays all-digital resolver-to-digital conversion is popularly invested for space-limited applications. However time delay is inevitable in demodulation part when frequency shifting algorithm used. Furthermore, the angle calculation result is affected by time delay. So the synchronous demodulation is analyzed in this paper to void time delay. The demodulated sine and cosine signals always exist with amplitude and quadrature errors. In order to eliminate the influence of these two errors, the double synchronous reference frame-based phase-locked loop (DSRF-PLL) is investigated in the angle calculation part. DSRF-PLL removes the angular position error caused by the amplitude error and makes the position error caused by the quadrature error to be a constant value, which can be easily compensated in the software. So the angular position can be detected with no time delay and error. The presented all-digital resolver-to-digital conversion scheme is verified by the simulation and experimental results at the end of this paper.

Abstract: To inspect structural conditions, structural displacement is needed to be monitored at any time. Therefore, our previous study proposed a ViSP (Visually Servoed Paired structured light system) which is composed of two sides facing with each other, each with a camera, a screen, and one or two lasers controlled by a 2-DOF manipulator. In this system, the relative translational and rotational displacement between two sides can be estimated by calculating positions of the projected laser beams on the screens and the rotation angles of the manipulators. To validate the performance of the system, the various experimental tests with a two-story structural model were performed. The estimated results were compared with the results from a laser displacement sensor which can be considered as a reference. The results show that the presented system has potential of estimating the response of the structures with high accuracy in real time.

Abstract: A camera support apparatus for supporting a video camera comprises a drive train device ( 1 ), a first inductive position sensor ( 23 ), ( 14 ) attached to a rotational output device ( 11 ) of the drive train device ( 10 ), and a second inductive position sensor ( 2 ), ( 3 ) attached to a rotational input device ( 4 ) which is operably connected to the drive train device ( 1 ), whereby the inductance sensed by the first position sensor ( 23 ), ( 14 ) is indicative of the rotational displacement of the rotational output device ( 11 ) and the inductance sensed by the second position sensor ( 2 ), ( 3 ) is indicative of the rotational displacement of the rotational input device ( 4 ).